Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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27 views

vehicles: power supply controlled by ignition with clean power off

I read a lot about this but I can't find a satisfying solution. I want the Pi to automatically power on when I start the engine and to cleanly power off when I turn it off. what I thought was to ...
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power problem with pi4 and 7" touchscreen

I have a Pi4 that I have connected to a 7" touchscreen. The touchscreen is powered by a microUSB cable, the Pi4 is then powered through the GPIO, per the instructions. I keep getting the low power ...
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Screen goes black for a second after I turn off PSU

I been setting up a Rpi 3 Model B to control some servos so I planed to use a PSU to power the servos since they will draw too much current for the pi to handle. At this point the setup is as ...
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39 views

Do I need to isolate the ground of the Pi from the ground of an external power supply powering multiple servos?

I have a Pi 3 Model B (powered by its ac adapter) sending multiple PWM control signals to up to 5 servos (SG5010). These servos draw usually 300 mA when they move and up to 1 A each when stalled so I ...
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38 views

What is Power Usage of Official Pi Touchscreen

What is the power usage of the official Pi 7" touchscreen in volts and amperage? I'm trying to calculate for a mobile power supply on a Pi 4B.
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1answer
33 views

Raspberry 3+ b and two external usb drives: lack of current

I've encountered the following problem: when I connect 1 external usb hdd to my Pi, everything works fine. But when I connect second one with the same characteristics, both drives are not usable. I ...
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1answer
46 views

Control Power via USB

Like in similar questions, I have my Pi on my TV and it currently draws power from the TVs USB. Fingers crossed, it currently works, but surely the Pi should have a better supply. Now, the good ...
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2answers
47 views

Is RPi 4B protected against GPIO shorting?

I read that a Pi 3's +5/3V GPIO pins when they contact, potentially frying the whole computer. Does this still happen/what's the risk of this happening on a 4B? Is it "protected" in any way?
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1answer
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Gracefully handle power loss Raspbian on a Pi Zero

I recently installed a Pi Zero running Pi-hole for my folks. They live in a rural area and only have a 4G Modem with a limited data plan. The issue, is that every now and then there are power outages ...
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24 views

Pi stopped booting after loosing power - can it be recovered

I have had a pi running as a bluetooth link to a meat curing machine and it's been awesome! The thing has run without issues for like 45 days. Well today I decided to move it to a new room and so I ...
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1answer
32 views

Reliable 5v relay

I have been using raspberry pi for my home automation project. To control 12v power, I use 5v relay low triggering to turn on or off the power. My coding and connection work fine. Problem is ...
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How to wire Li-Po to RPi 4B so that it Doens't Obstruct the GPIO or Processor

I started a post earlier about the best way to power an RPi 4B inside of a laptop (check link). Realizing that I will need two of the GPIO pins AND the processor NOT covered (for active cooling), I'm ...
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2answers
65 views

Check power usage of pi via terminal

How can I see what the power consumption and/or distribution of my pi is via terminal? I can only connect to the pi in question via ssh. So I can't see the "lightning bolt". I am concerned about ...
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1answer
23 views

PowerBoost 1000 5V with a 3.7v LiIon/LiPoly battery

I am very new to electronical components, and I am not sure if I can do the following: I am planning to start a project where a RPi Zero W would record 720p and/or 1080p videos (60fps ideally, else ...
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1answer
68 views

How to power a Raspberry Pi and servo motors with one power supply

I'm building a robot using Raspberry Pi and several servo motors. I'd like to power all components using a single lithium ion battery. I've looked into using a motor driver hat, but it seems the motor ...
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2answers
33 views

Raspberry PI 3 A+ x5 Cluster PSU Needed Recommendation

I plan to make this x5-x6 RPI 3 A+ cluster but I am no sure what USB Charger to use. I would really prefer something with 5-6 ports. I know the spec for output are 5V/2.5A and I plan to use it in ...
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3answers
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What is the correct (internal) voltage range for a RPi 4?

When running vcgencmd measure_volts on older RPi's, a normal reading is 1.2v However, on my new RPi 4, the voltage reading is: 0.8648v Does this indicate a power issue, or is this normal, and the ...
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How to power RPi with fan from single source?

Electronics beginner here. I have Raspberry Pi 4 GB variant. I have the following power requirements: power a 5V cooling fan 12V cooling fan (a spare cooler master)thanks @Milliways safely (i.e. ...
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41 views

Using USB-C on Pi 4 while powering the Pi via GPIO header pins?

I have an Pi 4 that I have setup as a router. I am using USB-C in Ethernet gadget mode to connect to my computer. I want to be able to disconnect and reconnect the Pi from my computer without it ...
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1answer
182 views

Use MacBook charger for Raspberry Pi 4

I am using the official 15.3W USB-C Power Supply to power up my Raspberry Pi 4. I got my self a second Raspberry Pi 4 but I haven't bought the power supply yet. Would I be able to use the Macbook ...
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UPS for Pi 3B and hdd

I'm quite new to the Pi world, but I need a UPS unit to power both a Raspberry Pi 3B and a 2.5'' hard disk used by the Pi. I thought a power bank could be the right choice for me, but I cannot find a ...
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39 views

Testbench for Raspberry Pi

I've owned Pi's since the first generation and have had various test rigs made from what I had to hand including stepping the voltage down from 12v and various bits of lego holding the components in ...
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2answers
35 views

Can I power two Pi from a single Lithium battery?

I need to run at least 2 Pi together, one controlling hardware and another sensing its environment. I would like to keep weight down by using a single LiIon battery. I have one to connect to a PiJuice ...
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2answers
114 views

Is it possible to power IR light module from 3.3v GPIO

Welcome, i've got a question that is bugging me for quite some time lately. I've got RaspberryPi zeroW with ZeroCam camera module (without IR filter). To get it to work in dark I bought IR LED ...
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2answers
385 views

What are the max current rating for 3.3v and 5v rail of the Rpi 4B

Does anybody know the max current rating of the 3.3v and 5 v rail of the new raspberry pi 4? i could not seem to find anybody benchmark this, i have read from someone that the new RPI 4 has a new ...
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1answer
66 views

USB-C to USB-C Cable Recommendations for Pi 4

Based on the USB-C implementation issue in Pi 4 rev. 1, I'm looking for recommendations on a non e-marked USB-C cable to use for power. Having dug through my own cable stash, I've found a couple of ...
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1answer
72 views

Regularly power up an autonomous Raspberry Pi? (e.g. once a week)

I want to power a Raspberry PI from a power bank, which should give me - according to various sources on the Internet - 30 to 70 hours of operation. How can I power up the Raspberry Pi once a week to ...
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35 views

raspberry pi 4 doesn't boot [duplicate]

I have a raspberry pi 4 which was working and suddenly turned off and ever since isn't booting up. Red and Greeen LED is continously on.(Not blinking) I have tried another memory card with differnt OS ...
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1answer
80 views

Rpi4B can control either one of two L298N modules, each driving two motors, but not both modules at the same time, why?

I'm using a pi 4 for a rover I want to build and I have 2 L298N drivers. I connected them using a breadboard to my pi so I don't need that much GPIO pins but only one pair of motors is working and ...
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2answers
114 views

Rpi GPIO pins + 2N2222 to independently drive two DC12V fans

I'm pretty new to Pi and electronics. I need to use my Pi as fans controller. I got two 12V fans and need to control it from Pi. I want to use external power supply (12V) to give them propper power. ...
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0answers
22 views

Powering solenoid from batterypack

Im trying to power my 6V solenoid that is connected to my 8 channel 5V relay using my 8 x AA batterypack. The pi is being powered through an adapter and the relay from the VCC to 5V pi. When the LED ...
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2answers
36 views

persistent canbus data logging during power loss

I am trying to setup a robust raspberry canbus data logger. The pi will be installed on a mobile vehicle where the power to the pi is disconnected every time the vehicle is switched off, which will ...
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1answer
123 views

How to determine the power state of the connected monitor

Main Question: Can my raspberry pi (powered on it's own) determine if power is being supplied to the monitor (powered by a wall plug)? I'm trying to determine the power state of the display that is ...
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2answers
2k views

Can a Raspberry Pi 4 power an external HD?

I was not able to power an external HD directly from a Raspberry pi 3 (the HD was constantly complaining about a lack of power). Would a Raspberry Pi 4 be able to power a portable hard drive (using ...
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38 views

USB Power Draw Plug In Order

I'm having some issues running a USB webcam and a USB speaker at the same time. If I plug in my webcam second, both devices work perfectly fine. If I simply boot with both plugged in, the speaker ...
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3answers
43 views

RaspberryPi turns on but wont start

So I come home and the power strip in which I left the RaspberryPi has tripped and it was off. I restart it, but I notice that the RaspberryPi wasn't giving any output when I plugged the monitor in. I ...
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94 views

Prevent under-voltage warnings from printing to the console

My Pi occasionally experiences an undervoltage for a second. I am working on fixing it but my main concern is that my Pi is being used in a kiosk application that displays a text output to the ...
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2answers
307 views

Rpi4B power connector SMD components damaged. How to replace it?

I broke what looks to be either a diode, capacitor or resistor on the board near the power connector of the pi 4B and I want to try to replace the surface mounted component. I know the chances are ...
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2answers
56 views

The best way to connect the 7” touchscreen

I have a pi 3 model B+ and the official raspberry Pi PSU, and the official 7” touch screen. I’m running Raspbian with all the latest updates. I have connected the display using a USB cable as ...
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2answers
66 views

About Power supply for Pi 4b [duplicate]

I have bought Pi 4b but now I don't wanna buy separate power adapter for it, I already have 5V,4A power adapter of my smartphone so can I use it for Pi 4b also??
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1answer
86 views

Will this work out (usb hub + rpi zero w + Zishan Z1 DSD)?

Well, I want to connect Rpi zero W and Zishan Z1/2 DSD in one case, but with both devices working in one port connected to PC. (with working usb device in Rpi if in "portable" mode or in both ...
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0answers
42 views

Raspberry Pi Losing Power

I bought a Raspberry Pi that had the entire n64 library loaded onto it. it takes an HDMI cable to plug into the TV and has a regular USB to micro USB for the power. I start it up and it begins to boot ...
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1answer
104 views

Pi 3 w/Pisound - Won't turn on unless wait a few minutes

I have a Pi 3 and Pisound (hat) and to turn it off I just unplug the cable. Now oddly, if I plug it back in right away I just get a red light, no blinking yellow BUT If I wait a few minutes to plug it ...
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1answer
49 views

Does a battery pack exists which does not need the microUsb power connection? [closed]

I'm building a small robotic car, which obviously needs battery power for it and the RPi. I've no problem with the battery pack for the car since it fits neatly into the chassis, but the RPi microUsb ...
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0answers
31 views

Fast turn off of a Pi in embedded applications [duplicate]

Is there any documentation about what the Pi is actually doing during its (excruitatingly) slow power down ? I want to build a Pi4 into a product that will definitely have the power cord pulled on a ...
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1answer
893 views

Raspberry Pi 4 not turning off HDMI monitor on idle

In the past, the Raspberry Pi computers could be made to turn off the monitor (as opposed to leaving the backlight on with a blank screen) when the Pi turned the screen off on inactivity. This could ...
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1answer
34 views

Using Both +5V GPIO Pins for More Current?

According to this website: https://pinout.xyz/pinout/pin2_5v_power# The +5V GPIO pins can push up to 1.5A of current, and are attached directly to the Pi's power supply. My question is, if I use ...
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0answers
248 views

power supply for multiple raspberry pi4

I am wondering if any one knows of a power supply that will power 4 or more raspberry pi4 with the type C plug? (Yes I would like the full 3 amps or more) I thought of a standard ATX power supply, ...
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2answers
84 views

Voltage drop when RaspberryPi boots

Im trying to learn robotics with raspberrypi but im having a problem. I have 6 AA batteries in a batteryholder that are connected to a breadboard and with M-M jumping wires its connected to a LM2596S ...
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1answer
56 views

Allow more power for USB Devices?

Is there a way to allow more power to USB Devices powered by the Pi I have a model B+, and I am unable to power my Webcam plugged into the Pi it has a single USB Connection so there's no way to power ...